Ground-state phase diagram and critical temperature of two-component Bose gases with Rashba spin-orbit coupling

Year: 2013

Authors: Zeng-Qiang Y.

Autors Affiliation: Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; BEC Ctr, INO CNR, I-38123 Povo, Italy.

Abstract: Ground-state phase diagram of two-component Bose gases with Rashba spin-orbit coupling is determined via a variational approach. A phase in which the fully polarized condensate occupies zero momentum is identified. This zero-momentum phase competes with the spin density wave phase when interspecies interaction is stronger than intraspecies interaction, and the former one is always the ground state for weak spin-orbit coupling. When the energies of these two phases are close, there is a phase separation between them. At finite temperature, such a zero-momentum condensation can be induced by a ferromagnetic phase transition in normal state. The spontaneous spin polarization removes the degeneracy of quasiparticles’ energy minima, and consequently the modified density of state accommodates a Bose condensation to appear below a critical temperature.

Journal/Review: PHYSICAL REVIEW A

Volume: 87 (5)      Pages from: 51606-1  to: 51606-5

More Information: The author acknowledges helpful discussions with T. Ozawa, A. Recati, and L. Yin. This work has been supported by ERC through a QGBE grant and by Provincia Autonoma di Trento.
KeyWords: Bosons; Condensation; Phase diagrams; Phase separation; Temperature
DOI: 10.1103/PhysRevA.87.051606

Citations: 18
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